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1 Investigations into the Molecular and Physiological Factors Influencing Low Temperature Breakdown in Stonefruit A. Jajo a, B. McGlasson, M. Jones and P. Holford University of Western Sydney Locked Bag 1797 Penrith South DC, NSW Australia J. Golding New South Wales Department of Primary Industries Gosford Primary Industries Institute Locked Bag 26 Gosford, NSW 2250 Australia C. Bonghi and F. Ziliotto Department of Environmental Agronomy and Crop Science University of Padova Viale dell Università, , Legnaro, Padova Italy P. Tonutti Scuola Superiore Sant Anna Piazza Martiri della Libertà, , Pisa Italy Keywords: chilling injury, 1-MCP, µ-array, peach, plum, cool storage Abstract Cold storage is essential for the successful distribution of stonefruit to distant markets; however most cultivars suffer chilling injury (CI), commonly referred to as low temperature breakdown (LTB). LTB is a significant problem for industry and the genetic factors responsible for its onset are not understood. Treatment of stonefruit with the ethylene antagonist, 1-methylcyclopropene (1-MCP) before cold storage has been shown to differentially affect the development of CI in peaches and plums. 1-MCP treatment increases the incidence of LTB in peaches but reduces it in plums (Fernández-Trujillo and Artés, 1997; Fan et al., 2002). These observations were confirmed and preliminary research into the effects of 1-MCP and cold storage on gene expression is reported herein. INTRODUCTION Stonefruit can be successfully exported by air freight but it is uneconomical. The alternative transport by sea is cheaper but takes longer. Sea freight is limited to voyages of about three weeks at 0 C because most cultivars suffer chilling injury (CI), commonly referred to as low temperature breakdown (LTB). Symptoms include mealiness or woolliness, bleeding of pigments into the flesh from the stone and skin in peaches, flesh browning and gel breakdown in plums (Lurie and Crisosto, 2005). Treatment of stonefruit with the ethylene antagonist, 1-methylcyclopropene (1- MCP) before cold storage has given variable results. LTB is increased in peaches and nectarines treated with 1-MCP prior to cool storage but reduced in Japanese-type plums (Fernández-Trujillo and Artés, 1997; Fan et al., 2002). Late season plums frequently have a longer cold storage life than peaches and nectarines and early season plums. The differential responses of peaches and plums to 1-MCP and cold storage offer a tool that could assist the identification of genes that control development of LTB. Identification of these genes could enable the development of markers that will assist plant breeders to select cultivars with reduced susceptibility to LTB. Interactions between 1-MCP and cool storage at the gene expression levels are observed in Zee Lady peach (ZP), Ruby Red (RR) and October Sun (OS) plums. MATERIALS AND METHODS ZP, OS and RR plums were obtained at commercial maturity from commercial a Proc. 7 th Intl. Peach Symposium Eds.: J. Girona and J. Marsal Acta Hort. 962, ISHS

2 orchards in Eastern Australia in 2008 and treated within 48 hours after harvest with 1- MCP (625 ηl.l -1 ) for 24 hours at 20 C. The fruit were stored at 0 and 5 C and transferred to 20 C at set intervals to assess the development of LTB. Symptoms of LTB were scored visually in fruit halves, cut at the equatorial plane. The fruit were assessed on a scale of 0 to 4 based on area affected by LTB. 0 = no LTB, 1 = less than 1/4 LTB, 2 = 1/4 to 1/2 LTB, 3 = 1/2 to 3/4 LTB and 4 = more than 3/4 LTB. The index is calculated where N1, N2, N3, N4 correspond to the number of fruit at the relevant LTB scores (1, 2, 3 and 4, respectively), and N is the total fruit number, ((1* N1) + (2* N2) + (3* N3) + (4* N4))*(100/(4*N)). Juice recovery was used as a measure of mealiness in peaches (Fan et al., 2002). RNA was extracted from fruit samples before cold storage and immediately after removal from four weeks of cold storage at 0 C. Gene expression was assessed using comparative analysis between 1-MCP treated and control fruit using the µ-peach 1.0 (Ziliotto et al., 2008). Significantly expressed genes were then matched to their relative ontologies using the Arabidopsis genome as a reference base by using MAPMAN platform ( as described by Thimm et al. (2004). RESULTS AND DISCUSSION Cold Storage Responses The severity of LTB in ZP stored at 5 C was greater following treatment with 1- MCP (Fig. 1). No significant differences in the incidence of LTB following treatment with 1-MCP were detected by subjective assessment of RR (data not shown) but LTB was significantly lower in OS following treatment with 1-MCP (Fig. 2). The interaction of the differences in the responses of ZP and OS was significant (p 0.05). Comparative Expression Analysis A large number of genes were differentially expressed by the three cultivars following treatment with 1-MCP and cold storage at 0 C (ZP 181, RR 264 and OS 38). Thirty-nine expressed genes were common to both ZP and RR, of these genes only 9 were induced or suppressed by 1-MCP. Similar comparative data were obtained for OS and RR; however, a smaller number of genes were found to be in common (Fig. 3). Categorization of the differentially expressed genes, based on the ontology of corresponding Arabidopsis genes, resulted in identifying the following BINs; metabolism of membranes, cell walls, lipids and stress enzymes. Genes involved in signalling and stress were also identified (Fig. 4). This preliminary study enabled the identification of genes that are differentially expressed in cultivars of peach and plums in response to treatment with1-mcp and cold storage. The storage experiments were repeated in 2009 and further RNA extracts was prepared for µ-array analysis. Quantitative PCR will be performed to evaluate the exact expression levels of genes of interest, previously identified in comparative µ-array analysis. Most of the genes that are differentially expressed and common between the cultivars have opposite trend of expression (i.e., up regulated in peach and down regulated in plum). Some of the genes that were differentially expressed relate to membrane structure which may be affected by chilling in sensitive plant species. Literature Cited Fan, X., Argenta, L. and Mattheis, J.P Interactive effects of 1-MCP and temperature on Elberta peach quality. HortScience 37(1): Fernández-Trujillo, J.P. and Artés, F Quality improvement of peaches by intermittent warming and modified-atmosphere packaging. Zeitschrift fur Lebensmittel -Untersuchung und -Forschung 205(1): Lurie, S. and Crisosto, C.H Chilling injury in peach and nectarine. Postharvest Biology and Technology 37(3): Thimm, O., Blasing, O., Gibon, Y., Nagel, A., Meyer, S., Kruger, P., Selbig, J., Muller, L.A., Rhee, S.Y. and Stitt, M MAPMAN: a user-driven tool to display 156

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